Seaborgium

From Wikipedia, the free encyclopedia
Jump to: navigation, search
dubniumseaborgiumbohrium
W

Sg

(Upo)
Appearance
unknown
General properties
Name, symbol, number seaborgium, Sg, 106
Pronunciation Listeni/sˈbɔrɡiəm/
see-BOR-gee-əm
Element category transition metal
Group, period, block 67, d
Standard atomic weight [269] g·mol−1
Electron configuration [Rn] 5f14 6d4 7s2
(predicted)[1]
Electrons per shell 2, 8, 18, 32, 32, 12, 2
(predicted) (Image)
Physical properties
Phase solid ((predicted)[2])
Density (near r.t.) 35.0 (predicted)[1][3] g·cm−3
Atomic properties
Oxidation states 6, 5, 4, 3
(only bolded oxidation states are known experimentally)
Ionization energies
1st: 757.4 (estimated)[1] kJ·mol−1
2nd: 1732.9 (estimated)[1] kJ·mol−1
3rd: 2483.5 (estimated)[1] kJ·mol−1
Atomic radius 132 (predicted)[1] pm
Covalent radius 143 (estimated)[4] pm
Miscellanea
Crystal structure body-centered cubic
CAS registry number 54038-81-2
Most stable isotopes
Main article: Isotopes of seaborgium
iso NA half-life DM DE (MeV) DP
271Sg syn 1.9 min 67% α 8.54 267Rf
33% SF
269Sg syn 2.1 min α 8.56 265Rf
267Sg syn 1.4 min 17% α 8.20 263Rf
83% SF
265mSg syn 16.2 s α 8.70 261mRf
265Sg syn 8.9 s α 8.90, 8.84, 8.76 261Rf
only isotopes with half-lives over 5 seconds are included here

Seaborgium is a chemical element. In the past, it has been named eka-tungsten but is now named seaborgium. It has the symbol Sg. It has the atomic number 106. Seaborgium is a radioactive element that does not exist in nature. It has to be made. The most stable isotope is 271Sg. Seaborgium-271 has a half-life of 2.4 minutes.

What seaborgium looks like is not known because not enough has been made to see it with human eyesight.

The element is named in honor of Glenn Seaborg.

Seaborgium is a transuranium element. This means that it is "beyond" (trans) the element Uranium in the sequence of elements.

Mendeleev predicted that Seaborgium would exist. He called the element eka-tungsten because of its location was near Tungsten in the Periodic Table. The chemistry of seaborgium is like the chemistry of tungsten.

Sources[change | change source]

  1. 1.0 1.1 1.2 1.3 1.4 1.5 Haire, Richard G. (2006). "Transactinides and the future elements". In Morss; Edelstein, Norman M.; Fuger, Jean. The Chemistry of the Actinide and Transactinide Elements (3rd ed.). Dordrecht, The Netherlands: Springer Science+Business Media. ISBN 1-4020-3555-1 .
  2. Östlin, A.; Vitos, L. (2011). "First-principles calculation of the structural stability of 6d transition metals". Physical Review B 84 (11). doi:10.1103/PhysRevB.84.113104 .
  3. Fricke, Burkhard (1975). "Superheavy elements: a prediction of their chemical and physical properties". Recent Impact of Physics on Inorganic Chemistry 21: 89–144. doi:10.1007/BFb0116498 . http://www.researchgate.net/publication/225672062_Superheavy_elements_a_prediction_of_their_chemical_and_physical_properties. Retrieved 4 October 2013.
  4. Chemical Data. Seaborgium - Sg, Royal Chemical Society

Other websites[change | change source]